In the fourth period of the periodic table,ho | vedclass

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Question

(C) The fourth period of the periodic table corresponds to the filling of the $4s$,$3d$,and $4p$ orbitals. Elements in the fourth period have valence

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(C) The fourth period of the periodic table corresponds to the filling of the $4s$,$3d$,and $4p$ orbitals. Elements in the fourth period have valence electrons in the $n=4$ shell and the $3d$ subshell. Since the $4d$ subshell only begins to fill in the fifth period (starting with Yttrium,$Z=39$),there are no elements in the fourth period that possess $4d$ electrons. Therefore,the number of such elements is $0$.

In the fourth period of the periodic table,how many elements have one or more $4d$ electrons?

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